We wouldn't expect a new iPhone until September of 2013 but already the rumors are beginning. DigiTimes, which has a spotty record in the rumor department, has today posted a translation of some news carried by the Taiwanese newspaper the Commercial Times. Their report says that trial production of an iPhone 5S will begin in December, with 50,000-100,000 units. Why so soon? The reason the iPhone 5 is in short supply is due to low "yield rates." That is, too many of the parts, or iPhone units themselves, are rejected as defective. That results in increased costs and short supplies.